Simple implementation

Cargo.toml

@@ -6,5 +6,10 @@ edition = "2018"
 description = "Easy to use I18n"
 keywords = ["i18n", "internationalization"]
 license = "MIT/Apache-2.0"
+repository = "https://github.com/terry90/internationalization-rs"
+homepage = "https://github.com/terry90/internationalization-rs"
 
 [dependencies]
+lazy_static = "1.4.0"
+glob = "0.3.0"
+serde_json = "1.0.40"

README.md

@@ -0,0 +1,17 @@
+# Internationalization
+
+An simple i18n implementation in Rust.
+
+> API documentation [https://crates.io/crates/internationalization](https://crates.io/crates/internationalization)
+
+## Usage
+
+```rust
+use internationalization::{init_i18n, t};
+fn main() {
+    init_i18n!("locales/*.json", "fr", "en");
+
+    let res = t("err.not_allowed");
+    assert_eq!("You are not allowed to do this", res);
+}
+```

src/i18n/mod.rs

@@ -0,0 +1,63 @@
+use glob::glob;
+use lazy_static::lazy_static;
+use std::collections::HashMap;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::Read;
+use std::sync::RwLock;
+
+type Key = String;
+type Locale = String;
+type Value = String;
+
+lazy_static! {
+    pub static ref TR: RwLock<HashMap<Key, HashMap<Locale, Value>>> = RwLock::new(HashMap::new());
+}
+
+pub fn read_files(pattern: &str) -> Vec<String> {
+    let mut contents = Vec::new();
+    for entry in glob(pattern).expect("Failed to read glob pattern") {
+        let file = File::open(entry.unwrap()).expect("Failed to open the file");
+        let mut reader = BufReader::new(file);
+        let mut content = String::new();
+        reader
+            .read_to_string(&mut content)
+            .expect("Failed to read the file");
+        contents.push(content);
+    }
+    contents
+}
+
+pub fn load_i18n(content: String) {
+    let res: HashMap<String, HashMap<String, String>> =
+        serde_json::from_str(&content).expect("Cannot parse I18n file");
+    TR.write().unwrap().extend(res);
+}
+
+/// Translates by key
+///
+/// # Panics
+///
+/// If a key is missing, the code will panic
+/// If a locale is not present for the key, ths will also panic
+///
+/// # Example
+/// ```no-run
+/// use internationalization::t;
+///
+/// fn main() {
+///     init_i18n!("locales/*.json", "fr", "en");
+///     
+///     let res = t("err.not_allowed");
+///     assert_eq!("You are not allowed to do this", res);
+/// }
+/// ```
+pub fn t(key: &str, locale: &str) -> String {
+    match TR.read().unwrap().get(key) {
+        Some(trs) => match trs.get(locale) {
+            Some(value) => value.to_owned(),
+            None => panic!("Missing language ({}) for key: {}", locale, key),
+        },
+        None => panic!("Missing key: {}", key),
+    }
+}

src/lib.rs

@@ -1,7 +1,30 @@
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {
-        assert_eq!(2 + 2, 4);
-    }
+//! # Internationalization
+//! An simple i18n implementation in Rust.
+
+//! > API documentation [https://crates.io/crates/internationalization](https://crates.io/crates/internationalization)
+
+//! ## Usage
+//!
+//! ```
+//! use internationalization::{init_i18n, t};
+//!
+//! fn main() {
+//!     init_i18n!("locales/*.json", "fr", "en");
+//!     
+//!     let res = t("err.not_allowed");
+//!     assert_eq!("You are not allowed to do this", res);
+//! }
+//! ```
+
+pub mod i18n;
+pub use i18n::t;
+
+#[macro_export]
+macro_rules! init_i18n {
+    ( $path:expr, $( $lang:expr ),* ) => {
+        use internationalization::i18n::{load_i18n, read_files};
+        for content in read_files($path) {
+            load_i18n(content)
+        }
+    };
 }